CN106603147B - Space-sky information network business retransmission method based on software defined network - Google Patents
Space-sky information network business retransmission method based on software defined network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/38—Flow based routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/42—Centralised routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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Abstract
The invention proposes a kind of space-sky information network business retransmission method based on software defined network.There is different quality of service requirement characteristicss of demand in bandwidth, time delay, packet loss according to space-sky information network different kinds of business, introduce the thought of software defined network, take central controlled mode, realize the separation of control plane and data plane, the tunnel control mechanism based on type of service is constructed in space-sky information network topology core net, multiple tunnels carry out the calculating of different kinds of business flow path according to reserved bandwidth, priority and tunnel traffic type.According to the upload message flow tuple match information that southbound interface transmits, judge that business is based on grouping or label forwarding.According to data plane node-flow status feedback information, tag path is planned according to priority again when Internet resources are inadequate.The forwarding mechanism that the present invention designs has flexibility and of overall importance, can efficiently realize that space-sky information network business is delivered.
Description
Technical field
The invention belongs to information network technique fields, and in particular to a kind of space-sky information network based on software defined network
Business retransmission method.
Background technique
Explanation of nouns:
GEO satellite: Geostationary Orbit geostationary orbit (positive circular orbit)
MEO satellite: Middle Earth Orbit Medium-Earth Orbit
LEO satellite: Low Earth Orbit Low Earth Orbit
PBTSP module: shortest path is utilized according to the tunnel information of initial subscription in conjunction with network topology class topology information
Dijkstra's algorithm, calculating meet business for the tag path of bandwidth and priority.
Dijkstra's algorithm: Dijkstra's algorithm refers to the shortest path from a vertex to remaining every vertex
Algorithm, solution is shortest route problem in digraph.
Space-sky information network is merged using all types of space platforms as carrier by multisystem system, is Incorporateization letter
The core for ceasing network, is the plan of focusing the consruction on of China 13.It mainly include GEO telecommunication satellite, navigation in space-sky information network
Satellite, remote sensing satellite, jet plane, terrestrial user.
Empty day radio channel resource is limited, compares ground network transmission medium (such as cable, twisted pair, optical fiber), works as biography
It is all kinds of to will receive ionosphere, heat radiation, earth magnetic field, space environment, terminal high-speed mobility to empty day field for defeated spatial spread
Type factor influences.Meanwhile in space-sky information network system structure ingredient, the satellite of all types of aircraft, multiple orbital attitudes,
The problem of data transmission will appear long delay.
Tactical data link is the core composition of space-sky information network, is the key element of integrated information fusion, decides
The overall efficiency of network.From the sixties in last century, U.S. army takes the lead in researching and developing and using a series of tactical data links, as informationization is sent out
The trend of exhibition, tactical data link are also constantly updating, main tactical data link include Link4A, Link4C, Link11,
Link16, Link22 etc..In the nearly several local message wars dominated by the U.S., all types of tactical data links are embodied greatly
Efficiency, accelerate to push R&D work to new types of data chain.
But since tactical data link specification and technology lack unification, each data-link forms " chimney " phenomenon, data
Chain lacks that flexibility, the availability of frequency spectrum are low, lack the overall point of view of information network, not no whole network security measures, different
The interoperability that interconnects between data-link is seriously restricted, and overall efficiency is influenced.And the following space-sky information network just by
To network-centric transition centered on platform, network-centric concept needs to provide a series of tactical data link step
Source is merged, maximized to realize the full dimension covering of environment.The network-centric different types of tactical data link money of fusion
Source, a practicable method are to provide effective flowcollector aggregation scheme FlowCollector in network layer to carry out different type tactical data link system
Interconnection solves the transmission of heterogeneous links application layer gateway using network layers of polymer and exchanges problem, allows space cell flexible
Into or out network increases the application service range of tactical data link in the environment towards space-sky information network.
The same with ground network, there is also more disadvantages, such as distributed routing for IP-based next generation satellite network
Algorithm the convergence speed is slow, lacks that the global visual field, network configuration is many and diverse, can not carry out flexibly configuring and updates and provide fine granularity
Network management services.In addition, the characteristics of satellite network, also brings more challenges to network performance, for example, network dynamic
Topological attribute causes routing algorithm more unstable, longer star distance and satellite cross top transmission data interactive mode make
It is longer to obtain global network routing update time-consuming.The industry that therefore, it is necessary to solve that space-sky information network how to be utilized to realize high efficient and flexible
Business delivery process.
Summary of the invention
The purpose of the present invention is to solve multi-service Delivery Problems in space-sky information network, and it is a kind of fixed based on software to propose
The space-sky information network business retransmission method of adopted network, realize multiple business flow flexibly control, efficient delivery.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of space-sky information network business retransmission method based on software defined network, step are as follows:
A is directed to space-sky information network network construction characteristic, as shown in Figure 1, network can be divided into core net, access net, user subnet
And control centre.Core net is made of GEO satellite or repeater satellite.Access net is made of MEO satellite and LEO satellite, Yong Huzi
Net can both net access network by access, can also be directly accessed GEO communication or repeater satellite.User subnet includes that remote sensing is defended
Star, remote sensing satellite subnet, other spacecrafts of space station, ground network and personal terminal.Control centre is located at ground network, including
Network operation control centre, data information center.Core net is to realize the key component of service traffics forwarding, internal to include control
Plane node processed and data plane node.Control plane node requires have very strong computing capability, to realize centralized control energy
Power is mainly undertaken by GEO satellite.
B different empty day information service types is different for bandwidth, the demand of priority, and control plane is built with tunnel style
Stand multiple virtual channel connections.Static system configures several tunnels and establishes industry after space-sky information network controls plane node starting
It is engaged in tunnel, safeguarding network Global Topological.It in message repeating process, is configured according to demand for services and original tunnel, forms business
Tag path, tag path add tag header at two layers between header and packet header.According in empty day network environment, as mark
Backbone node its entity object is mainly GEO satellite or part MEO satellite composition in label network, and quantity is relatively fewer, position
It is relatively stable.Backbone router BR (Backbone Router), border router ER (Edge Router).BR node constitutes empty
The core backbone network of its information network, ER node connect a plurality of types of sub-networks.Network topology such as Fig. 2 before tunnel is established,
Network topology such as Fig. 3 after tunnel is established.For the real-time optimization for realizing network state, tunnel state statistic unit will record last time
Message byte number and last registration time, the bandwidth usage in tunnel is calculated by the comparison of the two, then according to the stream
Status feedback information, dynamic adjust parameters for tunnel, meet space-sky information network service traffics demand.
After c such as Fig. 2 system initialization, label tunnel, which is established, to be completed.In space-sky information network setting, network topology inside stream
Amount is packet type.Packet traffic flows through core net from some subnet and enters purpose subnet, under initial situation, can not determine forwarding
Path, packet message can determine forward-path into control plane node in a certain way.Into after control plane node, first
Will do it the judgement of tag path, the mechanism of judgement mainly according to UDP/TCP destination slogan information in packet message stream tuple,
And predefined sky day type of service coding in network environment, judge whether the need for being satisfied with original tunnel for discharge pattern
It asks, in the case where meet demand, the tag path of the packet message stream can be determined according to specific tunnel routing algorithm, and will
For corresponding abstract factory table by southbound interface protocol configuration data plane node, packet message can be according to label information addition mark
Head is signed, as shown in Figure 3.When the service traffics leave tunnel, need to reject the tag head in message.
It needs to be carried out according to subsystem attributes feature in space-sky information network and system interior nodes feature in the step a
Network management, according to plan of operation configured tunneling technique.
Business Stream condition monitoring is enabled in the step b, it is special to calculate data plane intra-node multi-service flow in real time
Point is fed back by southbound interface to control plane node.
Compared with the prior art, the advantages of the present invention are as follows:
(1) present invention realizes the centralized control of space-sky information network using the thought of software defined network, by satellite node
Data forwarding function and the separation of routing decision function so that business repeating process is more flexible, network-control more directly, spirit
It is living, avoid that distributed routing algorithm convergence rate is slow, lacks that the global visual field, network configuration is many and diverse, can not flexibly be configured
The problems such as updating and fine-grained network management services be provided.
(2) present invention proposes grouping/label mixing forwarding.Pass-through mode based on label can be to avoid complicated routing table
Inquiry, tag recognition are the terminals of the node in virtual channel rather than network topology, and tagged manner can hide it is a variety of
The isomerism of two layers of access, while according to real-time stream mode feedback information dynamic adjustment control parameter, realize high efficient and flexible
Business is delivered.
Detailed description of the invention
Fig. 1 is space-sky information network networking schematic diagram of the present invention；
Fig. 2 is topological diagram before certain network example tunnel of the present invention is established；
Fig. 3 is topological diagram after certain network example tunnel of the present invention is established；
Fig. 4 is tag header structure of the present invention；
Fig. 5 is the tunnel adjustment stream of the space-sky information network business forwarding mechanism of the present invention based on software defined network
Cheng Tu；
Fig. 6 is the network layer of the space-sky information network business forwarding mechanism of the present invention based on software defined network
Figure.
Specific embodiment
The present invention is done with specific embodiment with reference to the accompanying drawings of the specification and is further described in detail.Fig. 1 is the present invention
The space-sky information network networking schematic diagram, Fig. 2 are topological diagrams before certain network example tunnel of the present invention is established, and Fig. 3 is this
Topological diagram after certain described network example tunnel is established is invented, Fig. 4 is tag header structure of the present invention, and Fig. 5 is institute of the present invention
The tunnel adjustment flow chart of the space-sky information network business forwarding mechanism based on software defined network is stated, Fig. 6 is of the present invention
The network layer figure of space-sky information network business forwarding mechanism based on software defined network.
The present invention is directed to the system environments feature for space-sky information network, and centralized control, service quality is taken to control
Concept.By the control plane decoupling of relatively simple data plane and agreement complexity.Such as Fig. 1, according to space-sky information network networking
Feature and composition divide different network components.On the basis of network component analysis, determine software defined network level as schemed
6, it mainly include three levels: application layer, control plane and data plane.Plane is controlled as most crucial interior in system architecture
Most complicated part in appearance and whole system.Global network state, including network node are obtained by link discovery protocols
Topological structure, dynamic node on off operating mode.Link discovery module uses Link Layer Discovery Protocol LLDP (Link Layer
Discovery Protocol) Dynamic Maintenance Global Topological information.Shortest path module based on priority and type of service and
Routing module generates corresponding message forwarding strategy using Global Topological information.PBTSP module mainly realizes label optimal path
Calculating, routing algorithm module is based primarily upon global data plane node topology information, utilizes APSP algorithm (All Pairs
Shortest Paths) calculate shortest path.The business of plan of operation module Main Analysis configuration different service quality demand.Tunnel
The initialization procedure of road customized module realization tunnel control.The monitoring of data plane node is mainly completed in switch management.State
The integrated control of network state is completed in management.Host-tracking is responsible for the condition monitoring to host node in network.Service abstraction is just
It is the control action that the specific service content of application layer is abstracted into control plane.
Different empty day information service types is different for bandwidth, the demand of priority, this is in control plane with tunnel
Mode establishes multiple virtual channel connections.Under initial situation, static system configures several tunnels.According in empty day network environment,
As backbone node in label network, its entity object is mainly GEO satellite or part MEO satellite composition, and quantity is relatively
Less, position is relatively stable.The initial stage is set by the way of static tunnel customization, it is initial that the foundation in tunnel is in system starting
The change stage.After tunnel is established, after calculating shortest path based on priority and type of service algorithm, formed current optimal
Tag path.System initialization is completed, and starts to handle different service traffics, data plane node is served as this moment
Role is data to be forwarded according to flow table, and carry out Information Statistics to by the message flow of the node with period regular hour,
The statistical information include a flow essential information (comprising source purpose grouping address, source destination slogan, label, in the period
Flow information).The statistical information is finally transmitted in controller with south orientation interface protocol by southbound interface.Task management is main
Complete the mission planning of control plane.LISP service is main to realize address (ADDR separated network agreement.The cloud of Openstack mono- open source
Management of computing platform.
For realize network state real time monitoring, as shown in figure 5, control plane node registration flow condition monitoring event, meeting
The status feedback information for monitoring a plurality of packet traffic in real time with some cycles is called after stream mode statistical information enters the component
Correlation function carries out relevant treatment.Its detailed process is as follows:
(1) the stream mode statistical information from certain data plane node includes a plurality of data traffic, and controller has specifically
Tunnel traffic recording unit, every stream of packets using the affiliated data plane mark of parameter and source purpose grouping address essential information with
Tunnel traffic recording unit is matched, and determines the tunnel ownership of the stream.
(2) tunnel state statistic unit will record message byte number and the last registration time of last time, pass through the ratio of the two
The bandwidth usage in tunnel is relatively calculated, establishment stage each tunnel in tunnel can determine reserved bandwidth numerical value.At this point, meeting
Current bandwidth according to tunnel actual bandwidth service condition and reserved bandwidth value adjustment tunnel is reserved.
(3) it when band is reserved in tunnel is wider than new flow demand bandwidth, does not need to plan tunnel routed path again, at this time
Tunnel bandwidth is adjusted to flow demand amount of bandwidth, improves bandwidth availability ratio.
(4) when new flow demand bandwidth is larger, the reserved bandwidth of current tunnel is unable to satisfy the demand of the flow, first
Check that whether the effectively reserved bandwidth of all links meets the flow demand on the routed path, continues step 6 when need satisfaction,
Step 5 is turned to when being unsatisfactory for.
(5) tunnel routed path is unsatisfactory for new flow demand at this time, according to the new bandwidth demand in tunnel and tunnel priority
Again tunnel routed path is planned, and the tag path that low priority tunnel before is established is rejected.If new planning routing
Path failure, then Bandwidth adjustment fails, and returns to mistake.When the success of new route planning, then 6 are turned to.
(6) at this point, planning routing again according to new route planning label allocation path, and by the tunnel of rejecting, and
Complete corresponding tag path configuration.Finally complete the statistics of tunnel state information and regular.
Claims (5)
1. a kind of space-sky information network business retransmission method based on software defined network, which comprises the steps of:
The first step, space-sky information network are divided into core net, access net, user subnet and control centre；Core net by GEO satellite or
Repeater satellite composition is the key component for realizing service traffics forwarding, internal to include control plane and data plane；Access net
It is made of MEO satellite and LEO satellite；User subnet include remote sensing satellite, remote sensing satellite subnet, other spacecrafts of space station,
Torus network and personal terminal, user subnet can both net access network by access, can also be directly accessed GEO satellite or relaying
Satellite；Control centre is located at ground network, including network operation control centre, data information center；
Data plane is made of multiple network equipments, and the network equipment is responsible for the transmission of data；Controlling plane includes controller, control
Plane is responsible for the management to the network equipment in data plane, wherein there is tunnel traffic recording unit on controller；It is logical to control plane
Southbound interface is crossed to be communicated with data plane；
Second step, control plane starting initialization, establishes multiple tunnels according to empty day type of service, determines that band is reserved in each tunnel
Width values；
Third step, control plane judge that business is based on label forwarding, detailed process according to packet message stream tuple match information
It is:
3.1 packet message streams enter core net from the user subnet of space-sky information network；
The control plane of 3.2 core nets is believed according to UDP destination slogan information in packet message stream tuple or TCP destination slogan
It ceases, predefined empty day type of service coding carries out the judgement of tag path in network environment, and according to the configuration of original tunnel
Whether meet the needs of discharge pattern, if meeting the demand, which is determined according to specific tunnel routing algorithm
The tag path of stream generates abstract factory table；
Abstract factory table is passed through southbound interface configuration data plane by 3.3 control planes；
The packet message of 3.4 data planes adds tag header according to the label information of abstract factory table；
3.5 packet messages wander about as a refugee open tunnel when, data plane reject message in tag header；
4th step, data plane periodically counts the message flow state information by data plane, then by flow state information
Control plane is fed back to by southbound interface；
5th step, control plane receive flow state information from data plane, and according to real-time flow state information dynamic adjustment tunnel
Road parameter, detailed process are as follows:
5.1 control planes receive flow state information from data plane, according to the affiliated data plane mark of every stream of packets and source mesh
Grouping address essential information, matched with tunnel traffic recording unit, determine the stream tunnel ownership；
5.2 tunnel state statistic units calculate tunnel actual bandwidth value according to certain time interval recorded message byte number,
Tunnel state statistic unit is reserved according to the current bandwidth of tunnel actual bandwidth value and tunnel reserved bandwidth value adjustment tunnel；
5.3, when tunnel reserves band and is wider than new flow demand bandwidth, do not need to plan tunnel routed path again, at this time tunnel
Bandwidth adjustment is new flow demand amount of bandwidth；
5.4 when new flow demand bandwidth is larger, and the reserved bandwidth of current tunnel is unable to satisfy the demand of the flow, first checks for
Whether the effectively reserved bandwidth of all links meets the flow demand on the routed path, goes to step 5.6 when need satisfaction, is discontented with
Step 5.5 is turned to when sufficient；
5.5 current tunnel routed paths are unsatisfactory for new flow demand, again according to the new bandwidth demand in tunnel and tunnel priority
Plan tunnel routed path, and the tag path that low priority tunnel before is established is rejected；If newly planning routed path
Failure, then Bandwidth adjustment fails, and returns to mistake；When the success of new route planning, then 5.6 are turned to；
Routing is planned according to new route planning label allocation path in the tunnel of rejecting by 5.6 control planes again.
2. the space-sky information network business retransmission method according to claim 1 based on software defined network, feature exist
In the tag path in the step 3 adds tag header at two layers between header and packet header.
3. the space-sky information network business retransmission method according to claim 1 based on software defined network, feature exist
Refer to source purpose grouping address in, the message flow state information in the step 4, source destination slogan, label, flow in the period
Measure information.
4. the space-sky information network business retransmission method according to claim 1 based on software defined network, feature exist
In GEO satellite or MEO satellite in the step 1 are the backbone node in label network.
5. the space-sky information network business retransmission method according to claim 1 based on software defined network, feature exist
In the core net of the space-sky information network in the step 1 is backbone router, and user subnet is connected as border router.
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